IBM System/370 Guide

U1
~~l
~
•
'Ta.ble
20.25.2. 3420, 2420,
and
2401 Magnetic Tape Unit characteristics
2! ~ ~
\.0
~Characteristic
I Model
3420 Ta e Units 2420 Ta e
24Ql
TaJ;!e
Units
Model ~
0.0
t""_"'"
3
Model
5 Model 7 Model 5 Model
2
Model
3 Model 5
C'l-,:::R
ZNN
(KB)
120
200
320 160
~~'?
Data rate 320 60
90 120
180
' -...1-
NO-...l
N
W
-...I
'?
Density 1600
1600 1600 1600
1600
800
800
1600
1600
-.l
0
(bytes/inch)
'ra.pe speed 75
125 200 100 200
75
112.5
75
112.5
(inches/sec. )
Nominal interblock .6 .6 .6 .6
.6 .6
.6
.6
.6
gap size in
inches (nine-
track)
Nominal
read 4.0 2.9 2.0 3.9 2.5 8
5.3 8
5.3
access to data
(ms)
In-column rewind Yes
Yes Yes Yes
Yes
No
No No
No
Nominal rewind
76
66
51 78
66 90 66 90
66
and unload
time
(sees. )
Nominal
rewind
70
60
45 72 60 84 60 84 60
to ready
status--full
2400-foo1: reel
(secs. )
l~utomatic
Standard-
Standard Standard Standard Standard Not Not Not
Not
threadin9
available
available
available available
'Time to ready 10
10
7
10
7
status after
load but1:on
pressed
(secs. )
Cartridge l:.oading StandaJrd Standard
Standard Standard Standard Not
Not
Not
Not
(10.5-inch available available available
available
reels only)
l~utomatic
reel
Yes
Yes
Yes
No
No
No
No No
No
latch
Recording PE PE PE PE
PE
NRZI NRZI PE PE
technique

IBM System/370 Specifications

General

Brand	IBM
Model	System/370
Category	Server
Language	English